Possible solution for erratic Digital Clock 1997 SE


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AndyFromWI
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Motorcycle: 1997 GL1500SE

Possible solution for erratic Digital Clock 1997 SE

Postby AndyFromWI » Tue Oct 20, 2015 6:33 am



Summary: Disconnected Ground from Fuel level sensor might affect digital clock speed.

My 1997 GL1500 SE experienced the problem with the digital clock where it started running 3-5 times too fast.
When troubleshooting I always ask myself, what has changed?

It my case I was working on an issue where my fuel gauge would not read properly and I had disconnected the two wire harness (C112) from the
Fuel level sensor (on the left side of the bike) which leads to the fuel gauge. I disconnected both wires, then ran the green/black ground and the yellow/white +resistance wire to a digital ohm LCD display. The purpose of the LCD display was to verify the sending unit is working properly, and as a temp hack for a fuel gauge.

On my first test ride for 100 miles, right away the clock started running fast. There was nothing special about the humidity, it was a nice 60 degree day.

To see if the this was the problem, I connected the ground wire (Green/Black) of the Fuel Level Sensor back to the ground line leading to the fuel gauge meter. I also shared this ground with my ohm LDC meter and kept the +resistance (Yellow/white) disconnected, from the fuel gauge, and l only went to my ohm LCD meter. With the ground Green/Black connected back to the fuel gauge, the clock behaved properly.

I have been running it this way for a week, and have not had any issues with the clock. When I get a chance I will remove the ground again, and see if the clock issue returns.

Looking at the wiring diagram, the Clock Speed Pulser shares a ground (S145) with the S153 ground.

Note: With the C112 Green/Black ground disconnected, the temp gauge still operated properly so there was some ground going to S168 but perhaps not enough ground for S145 that might interfere with the clock speed.

Again I do not have 100% proof that this one of the causes for the fast clock speed, but it also makes sense that when someone removes the digital clock to seal it, they have also created a better ground connection.

When I get a chance, I might disconnect the Ground again and confirm if the clock runs fast.

I’m wondering if anyone else out there has ran into issues that might support the theory that a too fast clock can be cause by a poor or missing ground wire.

Thank you.
-andy



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WingAdmin
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Re: Possible solution for erratic Digital Clock 1997 SE

Postby WingAdmin » Tue Oct 20, 2015 10:36 am

It's possible. The ground point you're looking at is actually for two things:

- Clock
- Speed pulser

(they are two different things)

Clock, Speed Pulser
Clock, Speed Pulser


The speed pulser is the hall-effect sensor in the instrument panel that generates a pulse depending on the speed of the front wheel. The sensor requires +12v and ground, and outputs a pulse. It uses S145 for its ground:

Wheel speed sensor
Wheel speed sensor


The clock also uses S145 for its ground:

Clock
Clock


So looking at this, I can see your theory - where the clock is not getting sufficient ground, and is instead finding its ground through the fuel gauge and sensor.

If this is the case, then you should be able to take S145 (wherever that is), or better, the green/black wire on C16, and run it to a known good ground. If that fixes the clock running fast problem, then that would indicate S145 (or perhaps G100 or G103) has an issue.

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NVSB4
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Re: Possible solution for erratic Digital Clock 1997 SE

Postby NVSB4 » Mon Nov 02, 2015 12:38 pm

Has anyone tried this potential fix yet?
My new 2 me '96SE has this issue and this would be a lot easier than tearing apart the cluster to try one of the other fixes that I've seen.
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Bigbiker0
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Re: Possible solution for erratic Digital Clock 1997 SE

Postby Bigbiker0 » Mon Nov 02, 2015 5:12 pm

I did clean the ground one the gaz tang and it's seem to work.
Drive safely Heaven do not exist.

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Bigbiker0
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Re: Possible solution for erratic Digital Clock 1997 SE

Postby Bigbiker0 » Fri Nov 13, 2015 6:12 am

Since last time my clock works like new one.
Drive safely Heaven do not exist.

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Bluewaterhooker0
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Re: Possible solution for erratic Digital Clock 1997 SE

Postby Bluewaterhooker0 » Fri Nov 13, 2015 7:28 pm

Bigbiker0,
Can you be a lot more specific about what you did ? I might try it, if I knew what you are talking about.

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Re: Possible solution for erratic Digital Clock 1997 SE

Postby Bigbiker0 » Sun Jan 03, 2016 6:09 am

Sorry to answer so late.
I did clean the ground wire on top of the gaz gage, it's seem to be the same ground for the digital clock.I did put dielectric silicon and the clock work like a new one keeping time .


Drive safely Heaven do not exist.


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